[issue21998] asyncio: support fork

[Guido van Rossum]

Guido van Rossum added the comment:

I don't actually know if the 5th option is possible. My strong requirement is that no matter what the child process does, the parent should still be able to continue using the loop. IMO it's better to leak a FD in the child than to close a resource owned by the parent. Within those constraints I'm okay with various solutions.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue21998>
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